how to connect the upper points of a sine curve by making them a curve?

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i want to extract a curve like what is in red from the plot in blue how can i do that?
je veux extraire une courbe comme il est indiqué en rouge d'aprés la plot en bleu comment je peux aire ça?

Accepted Answer

Star Strider
Star Strider on 7 Aug 2022
Use the envelope function (R2015b and later) in the Signal Processint Toolbox.
Perhaps:
envup = envelope(y);
The function has a number of options, so choose the one (probably 'peak') that gives the resullt you want.
.
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